Mechanical movement



3 Sheets-Sheet 1.

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T m X m 0 Lw LM I L m M J AG E M No. 458,347. Patented Aug. 25, 1891.

v 3 Sheets-Sheet 2.

(No Model.)

A. B. WILLOOX. MEOHANIGAL M'OVBMENT.

No. 458,347. Patented Aug. 25, 1891.

WE mums PEYEHS ca 3 Sheets-Sheet 3.

(No Model.)

T m X m V L0 LM I L m Em A Am B M No. 458,847. Patented Aug. 25, 1891.

. UNITED STATES PATENT OFFICE.

ALFRED B. WVILLCOX, OF CHICAGO, ILLINOIS.

MECHANICAL MOVEMENT.

SPECIFICATION forming part of Letters Patent No. 458,347, dated August25, 189 1. Application filed May 18, 1891. Serial No. 393,227- (Nomodel.)

To all whom it may concern:

Be it known that I, ALFRED B.W1LLoox, of Chicago, in the county of Cookand State of Illinois, have invented new Improvements in MechanicalMovements; and I do hereby declare the following, when taken inconnection with accompanying three sheets of drawings and the letters ofreference marked thereon, to be a full, clear, and exact description ofthe same, and which said drawings constitute part of this specification,and represent, in :Figure 1, a face view of the movement, showingtheparts in what is termed the down position; Fig. 2, the same as Fig. 1,showing the parts in the position when the shaft is zfmidway between itsextreme movements; Fig. 3, the same as Fig. 1, representing the parts iin the position as when the shaft is at its other extreme from Fig. 1;Fig. 4, the same as Fig. 1, representing the parts in the position aswhen the operating-shaft commences its return movement; Fig. 5, a sideview of the apparatus looking from the left of Fig. 2; Fig. 6, a topview of the same; Fig. 7, a modification.

This invention relates to an improved device for a mechanical movementadapted for use in various machines in which a reciprocating or rotativemovement is required with a rest or dwell for a predetermined length oftime at one point of the movement. 'Such requirements are found inpower-presses, punching-machines, power-shears, and mechanical feeds forvarious purposes. The mention of these will be sufficient to illustratethe general application of the movement, the object of the inventionbeing to produce the rest or dwell while the rotative movement of thedriving-shaft is continuous and uniform; and the invention consists inthe construction and combination of elements, as hereinafter describedand particularly recited in the claims.

A represents the driving-shaft to which a continuous rotation may beimparted in the direction indicated by the arrow. Made fast to the shaftand so as to revolve with it is a crank B, and on this crank twocrank-pins C D are arranged, both being in the same radial line of thecrank; but the pin D, more distant from the center of revolution thanthe pin C, and as clearly seen in Fig. 1.

E represents a shaft, to which an oscillatin which it works.

ing movement is given and from which the power to operate the mechanismis to be imparted. The axis of the shaft E is parallel with the axis ofthe shaft A, and from the shaft E an arm F projects in a plane parallelwith the plane of the crank B, and, as here represented, the face of thearm F is in the same plane as the face of the crank B, as seen in Fig.5. From the arm F a crank-pin G projects, the axis of which is parallelwith the axis of the two pins C D and of a length substantially equal tothe two pins C D. A connection is made between the pin C of the crank Bwith the pin G of the arm F by a connecting-rod H, the rod beingprovided with a predetermined extent of lost motion on one pin or theother, (here represented as by a slot I on the pin C,) the slot being ofa width corresponding to the diameter of the pin C,

but of a length greater than that of the diwith a slot K, in which thepin D works, andso that a predetermined extent of lost motion willbepermitted between the crankpin D and the pin G. The arm F is ofsomewhat greater length than the length of the crank B, and owing to thelost motion occasioned by the slots 1 K in the respective connectingrods an oscillating movement only will be imparted to the arm F from thecontinuouslyrevolving crank B.

In Fig. 1 the arm F is represented as in its extreme down position. Inthis position the pins stand in a direct line between the center of theshaft A and the center of the crank-pin G, and the crank-pin D stands atthe extreme lower end of the slot K, At the same time the crank-pin Cstands at the extreme upper end of the slot in which it works, so thatin this position there is a positive engagement between the crank andthe arm F in both directions, so that the arm F will be practically heldfirinthat is, will be forced to its down position by the pin D andprevented from passing beyond that position by the pin C. Starting fromthis point, Fig. l, the shaft A, with its crank B, revolves in thedirection indicated by the arrow, the crank-pin C, working against theend of its slot most distant ICO from the pin G of the arm F, will drawthe arm F with the crank, as indicated in Fig. 2. At the same time thepin D has moved from the end of the slot nearest the pin G and isapproaching the other extreme of its slot K. The position Fig. 2 issubstantially midway between the two extremes of movement of the arm F.The crank B continues its revolution, as indicated in Fig. 3, until thecenters of the pin G, the shaft A, and of the crankpins 0 D again comeinto line, but with the pins 0 D upon the opposite side of the shaft A,and, as seen in Fig. 3, at this point the pin D has reached the outwardextreme of its slot, while the pin 0 still remains in the same positionin relation to its slot in which it started, and this is the extreme upposition of the arm F. As the shaft A and crank continues the revolutionfrom the position seen in Fig. 3, if the arm F be held firm, the pins 0D of the crank will carry the links over with them; but the pins 0 Dapproach the pin G and recede from the extreme outer end of theirrespective slots, and, as seen in Fig. l, this movement of the pins 0 Dcontinuing, the pin D first reaching the extreme inner end of its slot,and untilthatpoint is reached neither of thecrankpins 0 D have anyeffect upon the arm F; but after the pin D comes into engagement withthe inner end of its slot, as seen in Fig. 4, then the power of therevolving crank will be communicated to the arm through its link J tothe arm F to commence a return swinging movement of the said arm F.

To hold the arm F firmly during the time in which the crank-pins arepassing from the extreme outer end of the slot, so as to obtain abearing upon the inner end of one of the slots, 2. segment L is madefast to the arm F, the outer surface of which is concentric to the shaftA when the arm is in the up position, as seen in Fig. 3. The crank B isconstructed with a projection M, from which a pin or friction-roll Nprojects toward the links. The distance of the pin or roll N from theshaft A corresponds to the outer surface of the segments L when the armis in the up position, as seen in Fig. 3, and the length of the segmentL is such that as the arm reaches its extreme up position, as seen inFig. 3, the pin N in the rotation of the shaft A will have just reachedthe upper end of the segment L, and continuing will pass onto thatsegment until the point when the crank-pins again commence their actionupon the arm F is reached, and, as seen in Fig. at, at this point thepin N escapes from the segment L. As the surface of the segmentcorresponds to the path of the inner surface of the pin N, that pintakes a bearing upon the face of the segment and rides upon thatsurface, thus holding the arm F firmly in the up position from the timethe pin passes onto the segment, as seen in Fig. 3, until it escapestherefrom, as seen in Fig. at.

The pin N having escaped from the seg ment, as seen in Fig. 4, thecontinued revolution of the shaft A through the pin D imparts thedownward movement to the arm F until the extreme down position isreached, at which time the outer end of the slot I of the 0011-necting-rod II will have come into engagement with the pin 0, as seen inFig. 1, and so that when that point is reached the upward movement ofthe arm F will immediately commence. The shaft A, making successiverevolutions, will impart a corresponding vibratory movement to the armF, and consequent oscillatory movement to the shaft E; but because ofthe lost motion between the crank of the shaft A and the arm F, the armF will remain inactive during a portion of the revolution of the shaft Acorresponding to the extent of the said lost motion, thus making theoscillatory movement of the shaft E intermittent. To illustrate theadvantage of this dwell or rest in the oscillation of the shaft E,suppose it is to be applied to impart the vertical reciprocatingmovement to the slide of a power-press. The dwell or rest occurs whenthe press-slide is in its up position, thus giving time for theintroduction or removal of work from below the slide, the slidedescending to do its work and immediately returning, as if by thecontinuous movement of the crank. As another illustration, takepowershears, in which the blades are brought together by the downwardmovement and on the rise will rest for a time for the introduction ofthe new work. As another illustration, take a feeding device for variousmachines where an intermittent feed is required, the feed will beproduced by the oscillation of the shaft E, and during the time of restof that shaft the work will be performed upon the material fed. Theseillustrations will be sufficient to enable persons skilled in the art towhich this invention pertains to apply it to the various purposes forwhich it is adapted. By making the slotsof the two connecting-rodslonger or shorter, the time of rest will be varied accordingly.

The employment of the segment as a means for holding the shaft E duringits time of rest, is desirable, but not essential to the invention, asthe friction or resistance to the movement of the shaft may besufficient to retain it in its position from the time it reaches its upposition until the crank-pins again come into action to return theshaft.

I have used the terms upward and downwardas illustrating the operationof the machine but not to confine the invention to any particulardirection of operation, as it willbe evident that this movement may beapplied to operate in any desired direction and for many purposes,circumstances alone governing the best or most desirable position inwhich the parts are to be relatively arranged.

It will be understood that the shaft A, while practically acontinuously-revolving shaft, will be subject to engagement ordisengagement of the power, as occasion may require as, forillustration, in a power punching-press, which operates to producesuccessive punchings so long as the shaft revolves; but the shaft isadapted to be stopped by the operator at any time, even between eachoperation, if so disposed or required. It will also be evident that theslot or lost motion of the connecting-rods may be made on the crank-pinGof the armF instead of upon their respective crank-pins C D, ifpreferred, as illustrated in Fig. 7, and accomplish substantially thesame result.

I claim- 1. The combination of a revolving shaft carrying a crank havingtwo crank-pins in the same radial line, but one more distant from thecenter of motion than the other, an oscillating shaft, an arm projectingradially from said oscillating shaft and carrying a proj eotingcrank-pin, and two connecting-rods arranged on the crank-pin of the saidoscillating shaft, the said connecting-rods joined, respectively, to thetwo crank-pins of the revolving shaft, the said connecting-rodsconstructed for a predetermined length of lost motion between thecrank-pin of the oscillating shaft and the two crank-pins of therevolving shaft, substantially as and for the purpose described.

2. The combination of a revolving shaft carrying a crank having twocrank-pins in the same radial line, but one more distant fromthe centerof motion than the other, an oscillating shaft, an arm projectingradially from said oscillating shaft and carrying a projecting crankpin,two connecting-rods arranged on the crank-pin of the said oscillatingshaft, the said connecting-rods joined, respectively, to the twocrank-pins of the revolving shaft, the said connecting-rods constructedfor a'predetermined length of lost motion between the crank-pin of theoscillating shaft and the. two crank-pins of the revolvin g shaft, thearm of the oscillating shaft constructed with a segment concentric withthe axis of the driving-shaft, as the said arm of the oscillating shaftstands in its nearest position to the said revolving shaft, the lengthof the said segments corresponding to the time of the said lost motion,and the revolving shaft provided with a projecting pin corresponding tothe outer surface of said segment and in the position relative to saidsegments, substantially as and for the purpose described.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

ALFRED B. WILLCOX. Witnesses:

C. E. ENLOW, D. SHAKBAZ.

